谷歌浏览器的源码分析(7)

 #015　　const bool selection_differs = (new_sel.cpMin != sel_before_change_.cpMin) ||
#016　　　　(new_sel.cpMax != sel_before_change_.cpMax);
#017　
#018　　// See if the text or selection have changed since OnBeforePossibleChange().
#019　　const std::wstring new_text(GetText());
#020　　const bool text_differs = (new_text != text_before_change_);
#021　
#022　　// Update the paste state as appropriate: if we're just finishing a paste
#023　　// that replaced all the text, preserve that information; otherwise, if we've
#024　　// made some other edit, clear paste tracking.
#025　　if (paste_state_ == REPLACING_ALL)
#026　　　paste_state_ = REPLACED_ALL;
#027　　else if (text_differs)
#028　　　paste_state_ = NONE;
#029　
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 #030　　// If something has changed while the control key is down, prevent
#031　　// "ctrl-enter" until the control key is released.　When we do this, we need
#032　　// to update the popup if it's open, since the desired_tld will have changed.
#033　　if ((text_differs || selection_differs) &&
#034　　　　(control_key_state_ == DOWN_WITHOUT_CHANGE)) {
#035　　　control_key_state_ = DOWN_WITH_CHANGE;
#036　　　if (!text_differs && !popup_->is_open())
#037　　　　return false;　// Don't open the popup for no reason.
#038　　} else if (!text_differs &&
#039　　　　(inline_autocomplete_text_.empty() || !selection_differs)) {
#040　　　return false;
#041　　}
#042　
#043　　const bool had_keyword = !is_keyword_hint_ && !keyword_.empty();
#044　
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