Hey there! Let me break down what's going on with that Ctrl + ↑ shortcut in Geany for you.

First off, the default behavior of Ctrl + ↑ in Geany is to jump to the start of the previous section/block in your document. The catch here is that how Geany defines a "section" depends entirely on the syntax highlighting rules applied to the current file—exactly what you suspected with headings and indentation!

Let's break down the difference between your .txt and .md files:

• For .txt files: Geany uses plain text mode by default, which treats any block of text separated by blank lines as a "section". That's why pressing Ctrl + ↑ takes you to the start of the previous blank-line-separated block, which feels like navigating to a prior section.
• For .md files: Geany switches to Markdown syntax highlighting. This mode has stricter rules for what counts as a navigable section—usually it only recognizes standard Markdown headings (lines starting with #, ##, etc.) or properly indented code blocks/other Markdown-specific elements. If your .md file's sections aren't using standard Markdown heading formatting, or don't have clear syntax-defined blocks, the shortcut won't behave the same way as it does in plain text.

If you want to fix this or adjust the behavior, here are a few quick tips:

• Check your shortcut bindings: Go to Edit → Preferences → Keyboard Shortcuts, then search for terms like "previous section" or "previous paragraph" to confirm the binding is the same across file types. Sometimes syntax-specific configs can override defaults.
• Tweak Markdown syntax rules: Head to View → Highlight Mode → Configure Filetype → Markdown to adjust how Geany recognizes sections in Markdown files. This takes a bit of trial and error, but you can customize what counts as a jump target.
• Quick workaround: If you just want the .txt-style behavior temporarily, open your .md file and switch the syntax mode to "Plain Text" using the dropdown in the bottom-right corner of the Geany window.

备注：内容来源于stack exchange，提问作者J. Mini