Autocomplete doesn't replace text sometimes

Issue Report Checklist

• Searched the issues page for similar reports
• Read the relevant sections of the Spyder Troubleshooting Guide and followed its advice
• Reproduced the issue after updating with conda update spyder (or pip, if not using Anaconda)
• Could not reproduce inside jupyter qtconsole (if console-related)
• Tried basic troubleshooting (if a bug/error)
  • Restarted Spyder
  • Reset preferences with spyder --reset
  • Reinstalled the latest version of Anaconda
  • Tried the other applicable steps from the Troubleshooting Guide
• Completed the Problem Description, Steps to Reproduce and Version sections below

Problem Description

Sometimes the autocomplete will not work as expected. Usually after using Spyder for a while

What steps reproduce the problem?

1. type “np.newa”
2. press “tab” to get an autocompletion

What is the expected output? What do you see instead?

I would expect “np.newaxis”

Instead I get “np.newanewaxis”

Versions

• Spyder version: Spyder 4.0.0.dev0
• Python version: Python 3.7.0 64-bit | Qt 5.9.3 | PyQt5 5.9.2 | Darwin 18.2.0
• Qt version:
• PyQt version:
• Operating System name/version: Mojave 10.14.1

Dependencies

pygments >=2.0 : 2.2.0 (OK) sphinx >=0.6.6 : 1.8.1 (OK) psutil >=0.3 : 5.4.7 (OK) pyls >=0.19.0 : 0.21.2 (OK) nbconvert >=4.0 : 5.4.0 (OK) pandas >=0.13.1 : 0.23.4 (OK) numpy >=1.7 : 1.15.2 (OK) sympy >=0.7.3 : 1.3 (OK) cython >=0.21 : 0.28.5 (OK) qtconsole >=4.2.0 : 4.4.1 (OK) IPython >=4.0 : 7.0.1 (OK) matplotlib >=2.0.0: 3.0.0 (OK) pylint >=0.25 : 2.1.1 (OK)

[ccordoba12]

Let’s talk about this in our meeting tomorrow.

[andfoy]

Another idea would be to compute the starting prefix between the existing string and the textEdit value.