I want to make a follow mode where placing the cursor within certain parts of the buffer will cause some action to happen in another window. For example, using helm-follow-mode with helm-occur will cause another window to jump to the context of the selected line. I want to do something similar, except that I want to use another window to jump to a point in some buffer(s) based on the current paragraph.
To give a more concrete example, I have a read-only buffer "A" which has three paragraphs, A1, A2, and A3. And another buffer "B" which has many lines of text.
+---------------------------+------------------------+
| | |
| BUFFER A | BUFFER B |
| | |
| Paragraph A1 | Line B1 |
| | Line B2 |
| Paragraph A2 | Line B3 |
| | Line B4 |
| Paragraph A3 | Line B5 |
| | Line B6 |
| | Line B7 |
| | Line B8 |
| | Line B9 |
| | |
+---------------------------+------------------------+
When my cursor moves from paragraph A1 into paragraph A2, buffer B should jump to some pre-determined position, for example line B8. This should happen without buffer A losing focus. Later, when my cursor moves out of paragraph A2 and into paragraph A3, buffer B will again jump to another pre-determined line, say B2. Now if I move the cursor back into paragraph A2, then buffer B will again jump to line B8, as before.
Is it possible to execute a "follow" action based on the cursor entering a paragraph? Can I do this with text properties? I want to maintain the ability to navigate buffer A just like any other read-only buffer (i.e. I want to select text and copy a region, perform an isearch within the buffer, etc.)
