tdf#150682 Change shortcut of inserting Math objects to Alt+Shift+E

Ctrl+Alt combinations don't work on Windows if they're also
doubling as AltGr modifiers, eg. in French keyboard layout,
Ctrl+Alt+'=' (which is the same as AltGr+'=' ) is '}'.
Avoid this by switching to different modifiers.

In addition '=' can require a modifier to enter, eg. in German
layout (Shift+0), so use an ASCII character, 'E' instead.

Ctrl+Shift+E is listed as a problematic combination in
Accelerators.xcu, settled on Alt+Shift+E in the end.

Also partially revert d156e891db34e88991a6c18fd3cff6feddfc61c8,
which did not work.

Change-Id: Ie3625f2c55171187fbbe2c4f79821eba8c25f40a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141227
Tested-by: Jenkins
Reviewed-by: Aron Budea <aron.budea@collabora.com>
(cherry picked from commit 77fb3ffdb6a8077cd3931985de923fbd1396d424)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/141362
Reviewed-by: Andras Timar <andras.timar@collabora.com>
diff --git a/officecfg/registry/data/org/openoffice/Office/Accelerators.xcu b/officecfg/registry/data/org/openoffice/Office/Accelerators.xcu
index 0497cb3..bec16cb 100644
--- a/officecfg/registry/data/org/openoffice/Office/Accelerators.xcu
+++ b/officecfg/registry/data/org/openoffice/Office/Accelerators.xcu
@@ -808,7 +808,7 @@ Ctrl+Shift+e aka E_SHIFT_MOD1 under GTK/IBUS is for some emoji thing
            <value xml:lang="en-US">.uno:FillDown</value>
          </prop>
        </node>
        <node oor:name="EQUAL_MOD1_MOD2" oor:op="replace">
        <node oor:name="E_SHIFT_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
            <value xml:lang="en-US">.uno:InsertObjectStarMath</value>
@@ -1737,7 +1737,7 @@ Ctrl+Shift+e aka E_SHIFT_MOD1 under GTK/IBUS is for some emoji thing
            <value xml:lang="es">.uno:SelectAll</value>
          </prop>
        </node>
        <node oor:name="EQUAL_MOD1_MOD2" oor:op="replace">
        <node oor:name="E_SHIFT_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
            <value xml:lang="en-US">.uno:InsertMath</value>
@@ -2957,12 +2957,6 @@ Ctrl+Shift+e aka E_SHIFT_MOD1 under GTK/IBUS is for some emoji thing
            <value xml:lang="en-US">.uno:PreviousAnnotation</value>
          </prop>
        </node>
        <node oor:name="EQUAL_MOD1_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
            <value xml:lang="en-US">.uno:InsertMath</value>
          </prop>
        </node>
        <node oor:name="1_MOD1" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
@@ -3082,6 +3076,12 @@ Ctrl+Shift+e aka E_SHIFT_MOD1 under GTK/IBUS is for some emoji thing
            <value xml:lang="es">.uno:SelectAll</value>
          </prop>
        </node>
        <node oor:name="E_SHIFT_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
            <value xml:lang="en-US">.uno:InsertMath</value>
          </prop>
        </node>
        <node oor:name="END_SHIFT_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
@@ -6221,7 +6221,7 @@ Ctrl+Shift+e aka E_SHIFT_MOD1 under GTK/IBUS is for some emoji thing
            <value xml:lang="es">.uno:SelectAll</value>
          </prop>
        </node>
        <node oor:name="EQUAL_MOD1_MOD2" oor:op="replace">
        <node oor:name="E_SHIFT_MOD2" oor:op="replace">
          <prop oor:name="Command">
            <value xml:lang="x-no-translate">I10N SHORTCUTS - NO TRANSLATE</value>
            <value xml:lang="en-US">.uno:InsertObjectStarMath</value>