Add borderless+accented mode line variants

I thought I had already applied this patch last week, but I had left it
in the git stash instead...

Thanks to John Haman for reporting this in issue 199:
<https://gitlab.com/protesilaos/modus-themes/-/issues/199>.

doc/modus-themes.info

@@ -48,7 +48,7 @@ does not yet form part of the latest tagged commit, is explicitly marked
 as such.
 
    Current development target is 1.4.0-dev.  This manual was built on
-2021-05-21 11:18 +0300.
+2021-05-23 23:14 +0300.
 
 * Menu:
 
@@ -846,6 +846,9 @@ Symbol: ‘modus-themes-mode-line’
   7. ‘accented’
   8. ‘accented-3d’
   9. ‘accented-moody’
+  10. ‘borderless-accented’ [ part of 1.4.0-dev ]
+  11. ‘borderless-accented-3d’ [ part of 1.4.0-dev ]
+  12. ‘borderless-accented-moody’ [ part of 1.4.0-dev ]
 
    The default produces a two-dimensional effect both for the active and
 inactive mode lines.  The differences between the two are limited to
@@ -880,6 +883,11 @@ to the default (‘nil’), ‘3d’, and ‘moody’ styles respectively, excep
 that the active mode line uses a colored background instead of the
 standard shade of gray.
 
+   Same principle for ‘borderless-accented’, ‘borderless-accented-3d’,
+and ‘borderless-accented-moody’ which use a colored background for the
+active mode line and have no discernible borders around both the active
+and inactive the mode lines.
+
    Note that Moody does not expose any faces that the themes could style
 directly.  Instead it re-purposes existing ones to render its tabs and
 ribbons.  As such, there may be cases where the contrast ratio falls
@@ -4562,75 +4570,75 @@ Node: No mixed fonts27513
 Node: Link styles28608
 Node: Command prompts30182
 Node: Mode line31381
-Node: Completion UIs34994
-Node: Mail citations36863
-Node: Fringes37742
-Node: Language checkers38404
-Node: Line highlighting40353
-Node: Line numbers41902
-Node: Matching parentheses42980
-Node: Active region43870
-Node: Diffs45088
-Node: Org mode blocks47139
-Node: Org agenda habits49064
-Node: Heading styles50899
-Node: Scaled headings55001
-Node: Scaled heading sizes55604
-Node: UI typeface58738
-Node: Headings' typeface59584
-Node: Advanced customization (do-it-yourself)60208
-Node: Per-theme customization settings (DIY)61571
-Node: Case-by-case face specs using the themes' palette (DIY)62917
-Node: Face specs at scale using the themes' palette (DIY)67381
-Node: Remap face with local value (DIY)72198
-Node: Cycle through arbitrary colors (DIY)74676
-Node: Override colors (DIY)81242
-Node: Override color saturation (DIY)86135
-Node: Font configurations for Org and others (DIY)91888
-Ref: Font configurations for Org and others (DIY)-Footnote-194316
-Node: Custom Org user faces (DIY)94503
-Node: Update Org block delimiter fontification (DIY)97875
-Node: Measure color contrast (DIY)99835
-Node: Load theme depending on time of day (DIY)102629
-Node: Backdrop for pdf-tools (DIY)103669
-Node: A theme-agnostic hook for theme loading (DIY)106431
-Node: Face coverage108821
-Node: Supported packages109290
-Node: Indirectly covered packages116064
-Node: Notes on individual packages116618
-Node: Note on inline Latex in Org buffers117436
-Node: Note on dimmerel117996
-Node: Note on display-fill-column-indicator-mode119481
-Node: Note on mmm-modeel background colors121102
-Node: Note for prism123481
-Node: Note for god-mode126707
-Node: Note on company-mode overlay pop-up128379
-Ref: Note on company-mode overlay pop-up-Footnote-1129067
-Ref: Note on company-mode overlay pop-up-Footnote-2129134
-Node: Note on ERC escaped color sequences129189
-Ref: Note on ERC escaped color sequences-Footnote-1130615
-Node: Note on powerline or spaceline130725
-Node: Note on SHR colors131137
-Node: Note on EWW and Elfeed fonts (SHR fonts)131572
-Node: Note on Helm grep132317
-Node: Note on vc-annotate-background-mode133804
-Node: Note on pdf-tools link hints134689
-Node: Frequently Asked Questions137121
-Node: Is the contrast ratio about adjacent colors?137677
-Node: What does it mean to avoid exaggerations?139184
-Node: Why are colors mostly variants of blue magenta cyan?141013
-Node: What is the best setup for legibility?145354
-Node: Contributing147934
-Node: Sources of the themes148331
-Node: Issues you can help with149069
-Node: Patches require copyright assignment to the FSF150269
-Node: Acknowledgements152564
-Node: Meta154994
-Node: GNU Free Documentation License156991
-Node: Indices182343
-Node: Function index182522
-Node: Variable index183759
-Node: Concept index185827
+Node: Completion UIs35421
+Node: Mail citations37290
+Node: Fringes38169
+Node: Language checkers38831
+Node: Line highlighting40780
+Node: Line numbers42329
+Node: Matching parentheses43407
+Node: Active region44297
+Node: Diffs45515
+Node: Org mode blocks47566
+Node: Org agenda habits49491
+Node: Heading styles51326
+Node: Scaled headings55428
+Node: Scaled heading sizes56031
+Node: UI typeface59165
+Node: Headings' typeface60011
+Node: Advanced customization (do-it-yourself)60635
+Node: Per-theme customization settings (DIY)61998
+Node: Case-by-case face specs using the themes' palette (DIY)63344
+Node: Face specs at scale using the themes' palette (DIY)67808
+Node: Remap face with local value (DIY)72625
+Node: Cycle through arbitrary colors (DIY)75103
+Node: Override colors (DIY)81669
+Node: Override color saturation (DIY)86562
+Node: Font configurations for Org and others (DIY)92315
+Ref: Font configurations for Org and others (DIY)-Footnote-194743
+Node: Custom Org user faces (DIY)94930
+Node: Update Org block delimiter fontification (DIY)98302
+Node: Measure color contrast (DIY)100262
+Node: Load theme depending on time of day (DIY)103056
+Node: Backdrop for pdf-tools (DIY)104096
+Node: A theme-agnostic hook for theme loading (DIY)106858
+Node: Face coverage109248
+Node: Supported packages109717
+Node: Indirectly covered packages116491
+Node: Notes on individual packages117045
+Node: Note on inline Latex in Org buffers117863
+Node: Note on dimmerel118423
+Node: Note on display-fill-column-indicator-mode119908
+Node: Note on mmm-modeel background colors121529
+Node: Note for prism123908
+Node: Note for god-mode127134
+Node: Note on company-mode overlay pop-up128806
+Ref: Note on company-mode overlay pop-up-Footnote-1129494
+Ref: Note on company-mode overlay pop-up-Footnote-2129561
+Node: Note on ERC escaped color sequences129616
+Ref: Note on ERC escaped color sequences-Footnote-1131042
+Node: Note on powerline or spaceline131152
+Node: Note on SHR colors131564
+Node: Note on EWW and Elfeed fonts (SHR fonts)131999
+Node: Note on Helm grep132744
+Node: Note on vc-annotate-background-mode134231
+Node: Note on pdf-tools link hints135116
+Node: Frequently Asked Questions137548
+Node: Is the contrast ratio about adjacent colors?138104
+Node: What does it mean to avoid exaggerations?139611
+Node: Why are colors mostly variants of blue magenta cyan?141440
+Node: What is the best setup for legibility?145781
+Node: Contributing148361
+Node: Sources of the themes148758
+Node: Issues you can help with149496
+Node: Patches require copyright assignment to the FSF150696
+Node: Acknowledgements152991
+Node: Meta155421
+Node: GNU Free Documentation License157418
+Node: Indices182770
+Node: Function index182949
+Node: Variable index184186
+Node: Concept index186254
 
 End Tag Table
 

doc/modus-themes.org

@@ -703,6 +703,9 @@ Possible values:
 7. ~accented~
 8. ~accented-3d~
 9. ~accented-moody~
+10. ~borderless-accented~ [ part of {{{development-version}}} ]
+11. ~borderless-accented-3d~ [ part of {{{development-version}}} ]
+12. ~borderless-accented-moody~ [ part of {{{development-version}}} ]
 
 The default produces a two-dimensional effect both for the active and
 inactive mode lines.  The differences between the two are limited to
@@ -737,6 +740,11 @@ default (~nil~), ~3d~, and ~moody~ styles respectively, except that the active
 mode line uses a colored background instead of the standard shade of
 gray.
 
+Same principle for ~borderless-accented~, ~borderless-accented-3d~, and
+~borderless-accented-moody~ which use a colored background for the active
+mode line and have no discernible borders around both the active and
+inactive the mode lines.
+
 Note that Moody does not expose any faces that the themes could style
 directly.  Instead it re-purposes existing ones to render its tabs and
 ribbons.  As such, there may be cases where the contrast ratio falls

modus-themes.el

@@ -5,7 +5,7 @@
 ;; Author: Protesilaos Stavrou <info@protesilaos.com>
 ;; URL: https://gitlab.com/protesilaos/modus-themes
 ;; Version: 1.3.2
-;; Last-Modified: <2021-05-23 10:04:57 +0300>
+;; Last-Modified: <2021-05-23 23:13:55 +0300>
 ;; Package-Requires: ((emacs "26.1"))
 ;; Keywords: faces, theme, accessibility
 
@@ -2045,9 +2045,15 @@ default).
 Similarly, `accented', `accented-3d', and `accented-moody'
 correspond to the default (nil), `3d', and `moody' styles
 respectively, except that the active mode line uses a colored
-background instead of the standard shade of gray."
+background instead of the standard shade of gray.
+
+Same principle for styles `borderless-accented',
+`borderless-accented-3d', `borderless-accented-moody', which
+apply a colored background to the active mode line, while they
+remove any noticeable border around both the active and inactive
+the mode lines."
   :group 'modus-themes
-  :package-version '(modus-themes . "1.3.0")
+  :package-version '(modus-themes . "1.4.0")
   :version "28.1"
   :type '(choice
           (const :format "[%v] %t\n" :tag "Two-dimensional box (default)" nil)
@@ -2058,7 +2064,10 @@ background instead of the standard shade of gray."
           (const :format "[%v] %t\n" :tag "Like `moody', but without noticeable border" borderless-moody)
           (const :format "[%v] %t\n" :tag "Two-dimensional box with a colored background" accented)
           (const :format "[%v] %t\n" :tag "Like `3d', but with a colored background" accented-3d)
-          (const :format "[%v] %t\n" :tag "Like `moody', but with a colored background" accented-moody))
+          (const :format "[%v] %t\n" :tag "Like `moody', but with a colored background" accented-moody)
+          (const :format "[%v] %t\n" :tag "Like `accented', but without a noticeable border" borderless-accented)
+          (const :format "[%v] %t\n" :tag "Like `accented-3d', but with a noticeable border" borderless-accented-3d)
+          (const :format "[%v] %t\n" :tag "Like `accented-moody', but with a noticeable border" borderless-accented-moody))
   :link '(info-link "(modus-themes) Mode line"))
 
 (defcustom modus-themes-diffs nil
@@ -2767,6 +2776,17 @@ property."
      `( :background ,bg-accent :foreground ,fg-accent
         :underline ,border :overline ,border
         :distant-foreground ,fg-distant))
+    ('borderless-accented
+     `(:background ,bg-accent :foreground ,fg-accent :box ,bg-accent))
+    ('borderless-accented-3d
+     `( :background ,bg-accent :foreground ,fg-accent
+        :box ( :line-width ,(or border-width 1)
+               :color ,bg-accent
+               :style ,(and alt-style 'released-button))))
+    ('borderless-accented-moody
+     `( :background ,bg-accent :foreground ,fg-accent
+        :underline ,bg-accent :overline ,bg-accent
+        :distant-foreground ,fg-distant))
     (_
      `(:background ,bg :foreground ,fg :box ,border))))