Test resizable suggest widget

[jrieken]

Refs: #29126

• anyOS @isidorn
• anyOS @dbaeumer

Complexity: 4

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The suggest widget is now resizable - that applies to the list of suggestions and the details panel. Test that

• the list of suggestions is resizable
• the details panel is resizable
• there is good minimal sizes
• the details panels doesn't steel space from the list
• the list remembers a custom size
• the list goes to "ideal" size when double clicking its resize sashes
  • the ideal height of the list is defined via editor.suggest.maxVisibleSuggestions
  • the ideal width is defined by the items
• the details panels only remembers a custom size for the current sessions (comment here if you disagree The detail of a suggest does not remember its height #109360)
• when resizing the list or window the details re-position themselves with this priority: left, right, below
• the list preferrers to be shown below the cursor but shows above if there isn't enough space
• the details align to top of the list unless they are too high in which case they align with the bottom of the list

[isidorn]

Great work, I really like these changes.

[dbaeumer]

Agree with @isidorn. None of my issue are critical (the are mostly corner cases) except may be #109447