fix(compose): default to quoting below, and focus the body on a reply

The previous commit fixed the cursor within each quote_position branch and
the user still saw the old layout, because the branches were already right:
what was wrong was the DEFAULT. quote_position shipped as `above`, and the
layout asked for is exactly what `below` already produced, a blank line at
the top with the quote underneath.

So the default flips, along with the fallback for a malformed value and the
warning naming it. Nothing needs an Upgrading note: compose has not been
released, so no config in the wild sets this.

Focus goes to the body whenever To: is already filled, which a Reply and a
Forward always are. The form's first widget took it otherwise, so the user
had to click into the editor before typing. A New message keeps the default,
since an empty To: is genuinely the first thing to fill in.

The focus test asserts on the window's focusWidget() rather than on
QWidget::hasFocus(): an unshown window is never active, so hasFocus() reads
false whatever the code does and would fail against a correct fix. Both
directions are mutation-checked, since focusing unconditionally passes the
reply case while breaking the new-message one.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/composewindow.cpp b/src/composewindow.cpp
index 59eaccc..1c9b492 100644
--- a/src/composewindow.cpp
+++ b/src/composewindow.cpp
@@ -143,6 +143,14 @@ ComposeWindow::ComposeWindow(const ComposeContext &context,
     // as the flag cleared, since markDirty() started it.
     m_dirty = false;
     m_autosaveTimer->stop();
+
+    // The body, whenever there is already a recipient: a Reply or a Forward
+    // has To: filled in from the context, so the first widget in the form
+    // would take focus and the user would have to click into the editor
+    // before typing. A New message keeps the default, since To: is empty and
+    // is genuinely the first thing to fill in.
+    if (!m_to->text().trimmed().isEmpty())
+        m_body->setFocus();
 }