chrisecker

Fixed it. Thanks for reporting.

When you want to develop cross platform apps which use the native widgets, there are not so many options. The two big players are qt and wx.

Yes, I can see what you mean: There are hand coded colors together with system colors. With the dark mode this gives white text on white background for the side panel. Thanks for mentioning.

Cursor positioning is simple. The layout is a tree of nested box. Each box knows the x,y-position of its children. There is also an index dimension which numbers possible cursor positions. A box lies from i1 to i2 in index space. You just iterate over all boxes holding cursor position i to find the cursor coordinate x,y. Selection is simple as well. It is defined by a start index s1 and end index s2. Some objects have a special selection, e.g. tables where you select a rectangular range of table cells.

Ropes are for strings. In a word processor you need text with formatting, and structures as tables, images and math.

My mistake. Now it works (on linux).

My apologies. I added the missing file.

You're right that hidden structure is often the cause of strange effects — but Group is not a document element in that sense. It's invisible at the index level too: when you iterate over the document by index, you pass through Groups transparently. A Group is purely a tree node for balancing purposes — it has no position in the document model that a cursor could land on, no semantic meaning, and no user-visible boundary. It has no effect the user can see or feel. Think of it like the internal nodes of a B-Tree: they exist to keep the structure efficient, but you never 'see' them when you traverse the data."