bug#43224: [PATCH] Support horizontal scrolling in the tab line

[Unknown <unknown@unknown.invalid>]

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First of all, thank you for the tab bar and tab line implementation in
Emacs 27.1. While using the feature, I found a possible improvement: Add
support for horizontal scrolling if your mouse or trackpad supports
it. The motivation for this change is that, as the tab line is a
horizontal UI, it makes sense to support horizontal scrolling if the
hardware supports it, as the scrolling feels more natural.

If you agree with the proposed feature, I've attached a patch that
implements it. Feel free to leave any review comments.


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From 722760083b644bb565b5b69f0fccb50cb8946d32 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Mart=C3=ADn?= <mardani29@yahoo.es>
Date: Sat, 5 Sep 2020 15:49:33 +0200
Subject: [PATCH] Add support for horizontal scrolling in tab-line

* lisp/tab-line.el ([tab-line wheel-left]): Bind left and right tab
line scrolling to the 'wheel-left' and 'wheel-right' mouse events.
([tab-line S-wheel-right]): Analogous change for the functions that
switch tabs.
* etc/NEWS: Announce the new feature.
---
 etc/NEWS         | 4 ++++
 lisp/tab-line.el | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/etc/NEWS b/etc/NEWS
index 749b28ac3f..954f8c8cc7 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -206,6 +206,10 @@ of the next command to be displayed in a new tab.
 Show/hide the tab bar independently for each frame, according to the
 value of 'tab-bar-show'.
 
+*** The tabs in the tab line can now be scrolled using horizontal scroll.
+If your mouse or trackpad supports it, you can now scroll tabs when
+the mouse pointer is in the tab line by scrolling left or right.
+
 ** New bindings in occur-mode, 'next-error-no-select' bound to 'n' and
 'previous-error-no-select' bound to 'p'.
 
diff --git a/lisp/tab-line.el b/lisp/tab-line.el
index e8c4dc4d93..40f80959cc 100644
--- a/lisp/tab-line.el
+++ b/lisp/tab-line.el
@@ -764,11 +764,15 @@ global-tab-line-mode
 (global-set-key [tab-line mouse-5]    'tab-line-hscroll-right)
 (global-set-key [tab-line wheel-up]   'tab-line-hscroll-left)
 (global-set-key [tab-line wheel-down] 'tab-line-hscroll-right)
+(global-set-key [tab-line wheel-left] 'tab-line-hscroll-left)
+(global-set-key [tab-line wheel-right] 'tab-line-hscroll-right)
 
 (global-set-key [tab-line S-mouse-4]    'tab-line-switch-to-prev-tab)
 (global-set-key [tab-line S-mouse-5]    'tab-line-switch-to-next-tab)
 (global-set-key [tab-line S-wheel-up]   'tab-line-switch-to-prev-tab)
 (global-set-key [tab-line S-wheel-down] 'tab-line-switch-to-next-tab)
+(global-set-key [tab-line S-wheel-left] 'tab-line-switch-to-prev-tab)
+(global-set-key [tab-line S-wheel-right] 'tab-line-switch-to-next-tab)
 
 \f
 (provide 'tab-line)
-- 
2.28.0