[MU4 Issue] Pressing Shift + nothing is treated as editing an element

Describe the bug
This is a somewhat obscure and maybe theoretical issue, but when you simply press and release the Shift key, it is treated as a keyboard shortcut that edits the selected element if it is in "edit mode" (i.e. grips are visible).

To Reproduce
Or rather, to make it apparent:
In debug builds:

1. Select for example a hairpin
2. press and release the shift key
3. in the console output, you see:

   01:19:16.436 | DEBUG | main_thread | Score      | endCmd: Undo stack current macro child count: 0
   

   which indicates that a command has been executed (although it is an empty command apparently).

In all builds:

1. Create score (1 instrument is enough)
2. enter a tempo marking on measure 3 and 5, so that mmrests will be broken
   (alternatively: enter a ritenuto spanning measure 3 and 4)
3. enter a hairpin spanning measure 2, 3 and 4 (so three measures in total)
   Note that the hairpin now starts at the start of the first mmrest:
   
4. select the hairpin
5. select the start grip of the hairpin
6. press and release the Shift key
   Although you think you have not done anything, the start of the hairpin suddenly jumps to the second mmrest:
   

Expected behavior
Shift + nothing = nothing

Platform information

• OS: reported on macOS

No files or tests are named in the issue, so begin by reproducing the Shift-only action with the listed hairpin and debug-build scenarios. Trace the keyboard handling and command output involved; done means pressing and releasing Shift alone produces no edit, movement, or command.