Syntax coloring lost after moving and re-indenting a line

[jaunis-ateme]

Environment:

• Ubuntu 24.04
• Clang 20

Moving, then changing the indentation of a single line of code breaks the syntax coloring. It happens only on large files, I couldn't reproduce it on smaller ones.

The clangd console displays an error "documentHighlight: Task was cancelled":

I[14:41:57.229] <-- textDocument/documentHighlight("2116")
I[14:41:57.230] --> reply:textDocument/documentHighlight("2116") 0 ms
I[14:41:58.345] <-- textDocument/documentHighlight("2117")
I[14:41:58.345] --> reply:textDocument/documentHighlight("2117") 0 ms
I[14:41:59.111] <-- textDocument/didChange
I[14:41:59.205] <-- textDocument/documentHighlight("2118")
I[14:41:59.213] ASTWorker building file ****** version 32 with command ******
I[14:41:59.257] <-- textDocument/didChange
I[14:41:59.707] <-- $/cancelRequest
I[14:41:59.708] <-- textDocument/documentHighlight("2119")
I[14:41:59.758] <-- textDocument/semanticTokens/full("2120")
I[14:41:59.759] <-- textDocument/inlayHint("2121")
I[14:41:59.779] --> textDocument/publishDiagnostics
I[14:41:59.787] --> reply:textDocument/documentHighlight("2118") 581 ms, error: Task was cancelled.
I[14:41:59.799] ASTWorker building file ******* version 33 with command ********
I[14:42:00.399] --> textDocument/publishDiagnostics
I[14:42:00.410] --> reply:textDocument/documentHighlight("2119") 702 ms
I[14:42:00.418] --> reply:textDocument/semanticTokens/full("2120") 659 ms
I[14:42:00.423] <-- textDocument/documentLink("2122")
I[14:42:00.423] <-- textDocument/foldingRange("2123")
I[14:42:00.430] --> reply:textDocument/inlayHint("2121") 670 ms
I[14:42:00.436] --> reply:textDocument/documentLink("2122") 12 ms
I[14:42:00.443] --> reply:textDocument/foldingRange("2123") 19 ms
I[14:42:00.925] <-- textDocument/documentLink("2124")
I[14:42:00.925] --> reply:textDocument/documentLink("2124") 0 ms
I[14:42:01.426] <-- textDocument/documentLink("2125")
I[14:42:01.426] --> reply:textDocument/documentLink("2125") 0 ms

[ghentschke]

How many lines does the file have?
What do yo mean by moving? Copy and paste of code?

[jaunis-ateme]

It has 1915 lines.

By moving I mean copy/pasting, or moving a line up with Alt + ↑

[ghentschke]

which TM4E version?

[jaunis-ateme]

[ghentschke]

I can reproduce this issue with enabled the on-type-formatting. It seems that clangd has its problem with on-type-formatting on large files.
I would recommend to disable this:

[jaunis-ateme]

I've tried disabling on type formatting, but the issue still happens with exactly the same symptoms.

I'm absolutely no expert in clangd, but looking naively at the console, it seems there is something wrong with the handling of document highlight cancellations. Maybe the documentHighlight reply n°2119 has not been properly taken into account following the cancellation of n°2118 ?

[ghentschke]

Maybe the documentHighlight reply n°2119 has not been properly taken into account following the cancellation of n°2118 ?

Haven't looked it up yet, but I assume that the documentHighlight request has been cancelled by LSP4E because of a timeout because the server didn't responded in time. More interesting are the semanticTokens.