CDT-LSP C++ Editor hover works very strange while all other Eclipse hovers (including legacy C++ Editor hover) are OK

[dyachenko-sergey]

CDT-LSP C++ Editor hover works very strange while all other Eclipse hovers (including legacy C++ Editor hover) are OK.

Problems unique for CDT-LSP C++ Editor hover:

1. Sometimes starts minimized to be 1-2 symbols width, sometimes - with normal size.
2. Does not remember manually resized dimensions.
3. Place cursor on something in C++ code and try to repeatedly and infinitely press F2 button (Focus) with 2 seconds between repeats: hover re-opens with different sizes from minimized to maximized in random order!

Hover is almost unusable, because in many cases it opens with 1-2 symbols width requiring manual resize - and does not remember new size at all.

All other Eclipse hovers (including legacy C++ Editor hover) are OK. This is purely CDT-LSP specific problem!

I use
Eclipse IDE for C/C++ Developers (includes Incubating components)
Version: 2025-03 (4.35.0)
Build id: 20250306-0812
on Windows 10

LSP server is clangd from LLVM 20.1.0 full installation (extracted from clang+llvm-20.1.0-x86_64-pc-windows-msvc.tar.xz).

[dyachenko-sergey]

Please note that funny trick (3) when hover repeatedly re-opens with different sizes from minimized to maximized in random order works only when you place cursor using keyboard navigation (arrow keys, etc.) and activate/re-activate hover with F2 button - without using mouse at all.

You will not see this if you activate hover with mouse.

In any case, currently new editor hover seems almost unusable for any real productive work.

[ghentschke]

Sometimes starts minimized to be 1-2 symbols width, sometimes - with normal size.

What do you mean with "1-2 symbols width" ? Can you please provide a screenshot? The hover content comes form LSP. I've to investigate it further. Do you mean this behavior?:

[dyachenko-sergey]

Yes it looks like on your screenshot, but it may have even lesser horizontal width suitable to 1 symbol (width) only as I said before.
When I hover over the same symbol in code in CDT-LSP, it's size seem to be quite random.
After resizing it never remembers it's size.

When I "focus" on this hover using F2 or placing mouse on the hover text - it does NOT expand to full content automatically, it requires manual resize every time.

Thus, it is not suitable for real usage.
No such problems at all with any other Eclipse hovers.

[dyachenko-sergey]

Sometimes hover width and-or height are even smaller - such tiny that absolutely no any text is visible inside until manual resizing.
And "focusing" on this hover also does nothing useful.

[ghentschke]

There seems to be an issue on Windows with TextMate and LSP hovers:

Please disable the Show TextMate token info on hovers in the Eclipse preference page:

[ghentschke]

Calculating the right size of the hover seems to be tricky. Especially when it's a compound hover (HTML source combined with other hover text). See also this eclipse UI issue

[dyachenko-sergey]

Triggering "Show TextMate token info on hovers" setting does not change anything on my system.

[dyachenko-sergey]

Please note that funny trick (3) when hover repeatedly re-opens with different sizes from minimized to maximized in random order works only when you place cursor using keyboard navigation (arrow keys, etc.) and activate/re-activate hover with F2 button - without using mouse at all.

You will not see this if you activate hover with mouse.

In any case, currently new editor hover seems almost unusable for any real productive work.

And what about this strange pseudo-random behaviour with hover size varying from almost zero to good size for the same item?!