[devhelp] App: explain why there is Ctrl+= keyboard shortcut for zoom-in

[Sébastien Wilmet <swilmet src gnome org>]

commit bbb8c28aa654a27736c1a9bb56456e685e0a67a6
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Thu Dec 21 12:17:46 2017 +0100

    App: explain why there is Ctrl+= keyboard shortcut for zoom-in

 src/dh-app.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/dh-app.c b/src/dh-app.c
index 2553cf4..800902f 100644
--- a/src/dh-app.c
+++ b/src/dh-app.c
@@ -210,6 +210,12 @@ setup_accelerators (GtkApplication *app)
         accels[0] = "<Control>minus";
         gtk_application_set_accels_for_action (app, "win.zoom-out", accels);
 
+        /* For "<Control>equal": Epiphany also has this keyboard shortcut for
+         * zoom-in. On keyboards the = and + are usually on the same key, but +
+         * is less convenient to type because Shift must be pressed too.
+         * Apparently it's usual on Windows to press Ctrl+= to zoom in.
+         * https://bugzilla.gnome.org/show_bug.cgi?id=743704
+         */
         accels[0] = "<Control>plus";
         accels[1] = "<Control>equal";
         gtk_application_set_accels_for_action (app, "win.zoom-in", accels);