From: Po Lu <luangruo@yahoo.com>
Date: Thu, 30 May 2024 13:31:18 +0000 (+0800)
Subject: Don't set text scale to fractional values in touch-screen-pinch
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=862d943b125a8110d0d1c1d479a877989f8007af;p=emacs.git

Don't set text scale to fractional values in touch-screen-pinch

* lisp/touch-screen.el (touch-screen-pinch): Take floor of
computed scale.

(cherry picked from commit 1ebb9cb93b2fefa84f18a63fb24c1ed4fcf095a7)
---

diff --git a/lisp/touch-screen.el b/lisp/touch-screen.el
index ca02ca3caf6..436b8d0954c 100644
--- a/lisp/touch-screen.el
+++ b/lisp/touch-screen.el
@@ -937,8 +937,8 @@ text scale by the ratio therein."
                               (aset touch-screen-aux-tool 7
                                     current-scale)))
         ;; Set the text scale.
-        (text-scale-set (+ start-scale
-                           (round (log scale text-scale-mode-step))))
+        (text-scale-set (floor (+ (round (log scale text-scale-mode-step))
+                                  start-scale)))
         ;; Subsequently move the row which was at the centrum to its Y
         ;; position.
         (if (and (not (eq current-scale